How do veins prevent back flow?

The pressure excreted by the heart pushes the blood back

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The valve in the veins prevent back flow

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The suction in the heart pulls up the blood

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None of the above

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Solution

The correct option is B
The valve in the veins prevent back flow

The valves in the veins are unidirectional. They allow blood flow only in one direction and this way veins do not have back flow.

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Due to presence of _______ , back flow of blood is prevented in veins.

Veins and arteries carry blood. Which of these carry blood :
(a) away from the heart ?
(b) back to the heart ?

Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

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